Roadstar CTV-1450 Service Manual
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Roadstar CTV-1450 Service Manual

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CTV-1450_2050

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Summary of Contents for Roadstar CTV-1450

  • Page 1 CTV-1450_2050...
  • Page 2 BLOCK DIAGRAM Speaker Audio Processor Audio Output TDA 9859 AN17821 Memory SWITCH IC AT24C16 SCART Tuner HEF4052BP Micro Processor (UOC IC ) Video Amplifier TDA 9351 FRONT Horizontal Horizontal 110VDC O/P driver O/P TR. SMPS Vertical output STV 9302A...

  • Page 3: Table Of Contents

    LOCAL 1500001000 LOCAL 4) vernice 1500002000 FA/LOC 3) vite per fissaggio pulsantiera, 4x12BT n.° 1100001767 3) logo ROADSTAR CTV 1450-KT n.° 1100009120 3) coperchio ricevitore IR n.° 1200001478 3) lente per led e ricevitore IR n.° 1200001725 3) rondella cinescopio in gomma, 6x22x3mm n.°...
  • Page 4 3) vite per fissaggio altoparlante, 4x12BT n.° FA/LOC 1100001767 3) nastro in feltro 25mm per bordo altoparlante 0,04 FA/LOC 1100001853 3) cravatta ferma cavo in metallo, 57 mm n.° FA/LOC 1100001858 n.° 3) assieme chassis 14" vedi tabella p. 2 vedi tabella 3) cappuccio per pulsante accensione n.°...
  • Page 5 3) vite per assiemaggio cabinet, 4x16BT n.° 1100004229 Busta accessori n.° 3) libretto istruzioni n.° LOCAL 1100009248 LOCAL 3) scheda di garanzia Roadstar n.° 1100010179 3) schema circuito elettrico CTV 1450KT, VE02 n.° LOCAL 1100010167 n.° LOCAL 3) lista Centri Assistenza Tecnica 1100010185 n.°...
  • Page 6 n°. Tipo Cinescopio Provenienza Codice componente Tipo Chassis Provenienza Codice compon. A34LEX10X SAMTEL - India VE02 14SMT 1100001679 1200004804 A34KQW42X01 SAMSUNG SDI - Malaysia VE02 14SMG 1700001001 1700002003 A33EKC..X.. EKRANAS - Lithuania VE02 14EKR 1700001002 1700002004...
  • Page 7 VILEUR UOC STEREO SCH CRT°å N151 SP101 AN17821 V912 R917 BF420 VE901 XS152 R915 A51JSY61X03 L911 82uH R918 B OUT V911 1.5K 2SC2330 R928 L912 G OUT SP102 82uH 1.5K R913 V913 R938 R OUT C911 BF421 R916 1.5K L913 C152 82uH +3.3V...

  • Page 8: Service Manual

    COLOR TELEVISION SERVICE MANUAL CHASSIS: - VE01 MODEL NO: - 1450KT, 2050KT, 2150KT...
  • Page 9 CONTENTS Safety Precautions------------------------------------------------------------------------ Introduction----------------------------------------------------------------------------------- 1. SCART details------------------------------------------------------------------------------ 2. Micro-Controller and Small Signal function TDA9351.------------------------ 3. Tuner------------------------------------------------------------------------------------------ 4. Video Switch HEF4052BP------------------------------------------------------------ 5. Sound Processor - TDA9859--------------------------------------------------------- 6. Sound Output - AN17821-------------------------------------------------------------- 7. Vertical Output Stage STV9302A-------------------------------------------------- 8. Video Output Amplifier ------------------------------------------------------------------- 9.

  • Page 10: Safety Precautions

    SAFETY PRECAUTIONS • Do not change any module unless the set is switched off. • The mains supply side of the SMPS transformer is live. Use an isolating transformer • Servicing of the CTV set should only be carried out by qualified person. •...
  • Page 11 1. PERI- TV SOCKET (SCART) PIN DETAILS OF SCART Name Description Signal Level Impedance Audio Out Right 0.5 V rms <1k ohm Audio In Right 0.5 V rms >10k ohm Audio Out Left + Mono 0.5 V rms <1k ohm AGND Audio Ground B GND...
  • Page 12 2. MICRO CONTROLLER AND SMALL SIGNAL FUNCTION WITH TDA 9351:- This IC is a combination of microcontroller and chroma (Small Signal function). This IC performs all important functions in TV receiver. The details of IC are bifurcated in two parts. Small Signal function and microcontroller 2A:- SMALL SIGNAL FUNCTION...
  • Page 13 attenuation of the residual video signals. With this system a high performance hi-fi stereo sound processing can be achieved. The AM sound demodulator is realised by a multiplier. The modulated sound IF signal is multiplied in phase with the limited SIF signal. The demodulator output signal is supplied to the output via a low-pass filter for attenuation of the carrier harmonics.
  • Page 14 the 110 degree types a choice must be made between the AVL function and a sub-carrier output for comb filter applications. This choice is made via the CBM0 and CMB1bits (in subaddress 22H). When the AVL is active it automatically stabilises the audio output signal to a certain level.
  • Page 15 The additional controls for these types are: • EW width • EW parabola width •  E W upper and lower corner parabola correction • EW trapezium correction •  V ertical zoom 2A.6: CHROMA AND LUMINANCE PROCESSING: - The chroma band-pass and trap circuits (including the SECAM cloche filter) are realised by means of gyrators and are tuned to the right frequency by comparing the tuning frequency with the reference frequency of the colour decoder.

  • Page 16: Tuner

    is also active during NTSC to obtain a good suppression of cross colour effects. The demodulated colour difference signals are internally supplied to the delay line. 2A.8: RGB OUTPUT CIRCUIT AND BLACK-CURRENT STABILIZATION : In the RGB control circuit the signal is controlled on contrast, brightness and saturation. The ICs have a linear input for external RGB signals.

  • Page 17: Sound Processor - Tda9859

    CHANNEL COVERAGE : BAND OFF AIR CHANELS CHANEL RANGE FREQUENCY ( IN MHZ) LOW BAND E2- S9 48.25 – 161.25 MID BAND S10 – S41 168.25 – 463.25 HIGH BAND E21 – E69 471.25 – 855.25 4. VIDEO SWITCH BU 4052: The HEF4052 is a dual four channel analog multiplexer. The main function of this device is to accept an AV input from SCART, external AV and switch the required output at pin no Z which is applied to small signal processing IC.

  • Page 18: Power Supply

    is used, then internal amplifiers are used to amplify the video signal. The transistorized amplifier can be designed by using transistor circuit in which 9 transistors are used. Chassis VE01 consist of transistorized video amplifier circuit. 9. POWER SUPPLY: The DC Voltages required at various part of the chassis are applied by SMPS transformer controlled by STR 0765, which is designed for deriving, controlling and protecting switiching transistor of SMPS.
  • Page 19 11. IC DISCRIPTION AND PIN DETAILS • TDA 9351 TV Signal processor- Teletex decoder with embedded microcontroller • HEF 4052BP- Video Switch • STV 9302- Vertical Deflection Output • 24C16- Memory IC • TDA 9859- Sound Processor • AN 17821- Sound Output •...
  • Page 20 • Integrated chroma band-pass filter with switchable centre frequency • Only one reference (12 MHz) crystal required for the microcontroller, Teletext- and the colour decoder • PAL/NTSC or multi-standard colour decoder with automatic search system • Internal base-band delay line •...
  • Page 21 • In the 10 page versions inventory of transmitted Teletext pages stored in the Transmitted Page Table (TPT) and Subtitle Page Table (SPT) • Data Capture for 525/625 line WST, VPS (PDC system A) and Wide Screen Signalling (WSS) bit decoding •...
  • Page 22 PINNING: TDA 9351 Pin No Description Value 1. Stand By Stand by Low Level: 0 High Level : 3.31V 2. SCL Clock Signal Output Low level : 0V High Level : 3.31V 3. SDA Data Out put Low Level : 0V High Level : 3.31V 4.TUNING Tunning ( Not connected)
  • Page 23 18. GND3 Ground for TV processor 19. DECBG Band gap decoupling 3.97 V 20. AVL / EWD Automatic volume leveling Low level : 0 / East west drive output High level : 2.61V 21. VDRB vertical drive B output 0.59V 22.
  • Page 24 37. PLL IF IF-PLL loop filter Low level : 0V High Level : 2.35V 38. IFVO / SVO IF video output / selected 3.27V CVBS output 39. Vp1 Main supply voltage TV- processor (+8 V) 40. CVBSINT Internal CVBS input 2VPP 41.
  • Page 25 58. XTAL IN Crystal oscillator input 1.57V 59. XTAL OUT Crystal oscillator output 1.76V 60. RESET Reset 61. VddP Digital supply to periphrery 3.3V 62. AV1 input from video 0.06V switching IC (+3.3 V) 63. AV2 input from video 0.6V switching IC (+3.3 V) input 64.
  • Page 26 3. ZB ( Common input / outputs) 0.50V 4. Y3B (independent inputs / out 0.50V puts) 5. Y1B (independent inputs / out 0.40 V puts) 6. INH ( enable input (active LOW) ) 7. VEE 8. VSS 9. A1 (address inputs) 0.21V 10.
  • Page 27 PINNING: STV 9302 Voltage in Volts Pin no. Pin Description ( 1 Khz Colour Pattern) INPUT(INVERTING) 0.59 V SUPPLY VOLTAGE 14 V FLY-BACK GENERATOR -11.43 V Gnd or Negative supply -12.82 V OUT PUT 0.33V OUTPUT-STAGE SUPPLY 14.29 V INPUT(NON INVERTING) 0.61 V 11D.
  • Page 28 PINNING :- 24C16 Pin Description Stand-By ON Condition Voltage Voltage ( 1 Khz Colour Pattern) SDA. Serial Data Input 3.12 V 3.23 V SCL. Serial clock 2.54 V 2.56 V 11E. IC-TDA9859 (SOUND PROCESSOR) :- TDA 9859 sound processor provides the sound control facilities for the main and the scart channel of a T.V set.
  • Page 29 PINNING: TDA 9859 Pin no. Pin Description Stand By Voltage AV Left input Scart Input Left Low Level : 0.32V Channel High Level : 3.8V P 1 Not connected Port -1 Input MAIN Left Main Input Left 0 Low Level : 0V Channel High Level : 3.8V...
  • Page 30 Serial Clock Input Low Level : 2.54V High Level : 2.55V Serial Data Ip / Output Low Level : 3.10V High Level : 3.27V MAIN OUT Left Loud Speaker Out Put Low Level : 0V Left Channel High Level : 3.8V Treble Capacitor Low Level : 0.10V Connection Left...
  • Page 31 11F. SOUND OUTPUT IC: the IC AN178421 is used as the AF out amplifier for the Stereo application. It is supplied by 13 volts from the 13 volt DC coming from a separate winding in the SMPS transformer. An out power of 1.5 Watt can be delivered into an 8 Ohm Load. PINNING:- AN17821 Pin No Description...
  • Page 32 design in CTV power supply. With this features it offers really safe and reliable power management Features : • Quasi resonant convertor controller. • Internal bus mode controller. • Pulse by pulse current limiting. • Over current latch protection. • Over Voltage protection( V-Sink Min 11 Volt). •...
  • Page 33 Transistor Base Voltage Collector Voltage Emitter Voltage B931 3.95 V 88.9V 3.35V B911 3.98V 87.1V 3.38V B921 86.1V 3.42V V923 6.8V 86.4V V932 88.7V 170.4V V912 86.9V 175.2V 87.3V V913 87.1V 6.82V 87.4V V933 88.7V 6.83V V922 85.9V 175V 86.2V 12.
  • Page 34 6) To Change the value of parameter press Volume + / Volume – Key, To move from one parameter to another press Channel + / Channel – Key on Remote Handset. 7) Press “Stand-By” Key to come out of Design Mode. •...
  • Page 35 SERVICE PRAMETERS: MENU 2 Parameter Variation Default Setting Remarks 0-63 For RF AGC adjustment Search Speed SERVICE PRAMETERS: MENU 3 Parameter Variation Default Setting Remarks 0-100 0-100 Screen variation. 0-63 R drive. 0-63 G Drive 0-63 R cut off 0-63 G cut off 0-63 B cut off...
  • Page 36 DESIGN PRAMETERS: MENU 5 Parameter Variation Default Setting PP Mode Std / dynamic / mild Brightness 0-100 75 / 75 / 75 Contrast 0-100 75 / 100 / 50 Color 0-100 50 / 50 / 50 Sharpness 0-100 50 / 50 / 50 SC Brightness 0-63 Cool BD Offset...
  • Page 37 DESIGN PRAMETERS: MENU 7 Parameter Variation Default Setting 38.9 / 38 / 58.75/ 45.75 38.9MHZ OFF / ON OFF / ON OFF / ON OFF / ON SIF PRIORITY DK/ I/ M/ BG OFF/ ON SVHS OFF/ON OFF/ON EURO AV OFF/ON S CURVE P1 0-70...
  • Page 38 DESIGN PRAMETERS: MENU 9 Parameter Variation Default Setting BAND MODE START ON ON DELAY 6-15 LOGO OFF / ON NVM LOGO OFF / ON TXT BRIGHTNESS 0-63 SPANISH BIT OFF / ON NOT 0 OFF / ON NOT 1 OFF / ON NOT 2 OFF / ON NOT 3...

  • Page 39: At24C16

    BLOCK DIAGRAM Speaker Audio Processor Audio Output TDA 9859 AN17821 Memory SWITCH IC AT24C16 SCART Tuner HEF4052BP Micro Processor (UOC IC ) Video Amplifier TDA 9351 FRONT Horizontal Horizontal 110VDC O/P driver O/P TR. SMPS Vertical output STV 9302A...
  • Page 40 VE01 CHASSIS ALLIGNMENT PROCEDURE ON MANUFACTURING LINE PRODUCT : CTV STAGE: HARNESING AT F-A LINE PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION...
  • Page 41 PRODUCT : CTV STAGE: SCREEN ADJUSTMENT PCB/ASSY :FA Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION SERVICE REMOTE TV SET FEVIBONAD INSULATED SCREW CHECKED BY...
  • Page 42 CPM Assy FIG-04 FIG-01 FIG-02 FIG-03 PRODUCT : CTV STAGE: GEOMETRIC ALIGNMENT PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION SERVICE REMOTE TV SET SELECT RETMA PATTERN (EU 5CH).
  • Page 43 PRODUCT : CTV STAGE: OSD ALIGNMENT PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION SERVICE REMOTE TV SET PRESS "MENU+6483" KEYS SEQUENCE TO ACCESS THE MANUFACTURING MODE. THEN PRESS HOTKEY "1".
  • Page 44 THE ADJUSTMENTS ARE MUTUALLY INTERDEPENDENT SO ADJUST ALL ABOVE MENTIONED PARAMETERS TILL THE RED BLO BAR COMES AT CENTRE AND "NG" DISPLAY TURNS IN TO "GOOD" . SERVICE PARAMETERS:- SPECIFICATIONS: RGB CUTOFF'S FOR ALL OTHER BRANDS UOC/VX05T/ PIP M OC POC/ROADSTAR TSB2 VX04T DSPM2129 X= 275+/- 5 R CUT y= 292+/- 5...
  • Page 45 SELECT SETTINGS MENU AND CHECK THAT TXT=EAST/WEST " FUNCTION. PRESS "SUB CODE " KEY ON REMOTE & CHECK "DK/I/BG" OPTIONS PRODUCT : CTV STAGE: NTSC / H.V. CHECKING PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY...
  • Page 46 PRODUCT : CTV STAGE: SOUND Q.C.-2 PCB/ASSY :F.A. RoadStar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION TV SET REMOTE HAMMER CHECKED BY CONNECT THE RF SIGNAL CORD TO TUNER.
  • Page 47 VILEUR UOC STEREO SCH 2005.10.10 CRT°å N151 SP101 AN17821 V912 R917 BF420 VE901 XS152 R915 A51JSY61X03 L911 82uH R918 B OUT V911 1.5K 2SC2330 R928 L912 G OUT SP102 82uH 1.5K R913 V913 R938 R OUT C911 BF421 R916 1.5K L913 C152 82uH...
  • Page 48 VE01 CHASSIS ALLIGNMENT PROCEDURE ON MANUFACTURING LINE PRODUCT : CTV STAGE: HARNESING AT F-A LINE PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION...
  • Page 49 PRODUCT : CTV STAGE: SCREEN ADJUSTMENT PCB/ASSY :FA Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION SERVICE REMOTE TV SET FEVIBONAD INSULATED SCREW CHECKED BY...
  • Page 50 CPM Assy FIG-04 FIG-01 FIG-02 FIG-03 PRODUCT : CTV STAGE: GEOMETRIC ALIGNMENT PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION SERVICE REMOTE TV SET SELECT RETMA PATTERN (EU 5CH).
  • Page 51 PRODUCT : CTV STAGE: OSD ALIGNMENT PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION SERVICE REMOTE TV SET PRESS "MENU+6483" KEYS SEQUENCE TO ACCESS THE MANUFACTURING MODE. THEN PRESS HOTKEY "1".
  • Page 52 THE ADJUSTMENTS ARE MUTUALLY INTERDEPENDENT SO ADJUST ALL ABOVE MENTIONED PARAMETERS TILL THE RED BLO BAR COMES AT CENTRE AND "NG" DISPLAY TURNS IN TO "GOOD" . SERVICE PARAMETERS:- SPECIFICATIONS: RGB CUTOFF'S FOR ALL OTHER BRANDS UOC/VX05T/ PIP M OC POC/ROADSTAR TSB2 VX04T DSPM2129 X= 275+/- 5 R CUT y= 292+/- 5...
  • Page 53 SELECT SETTINGS MENU AND CHECK THAT TXT=EAST/WEST " FUNCTION. PRESS "SUB CODE " KEY ON REMOTE & CHECK "DK/I/BG" OPTIONS PRODUCT : CTV STAGE: NTSC / H.V. CHECKING PCB/ASSY :F.A. Roadstar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY...
  • Page 54 PRODUCT : CTV STAGE: SOUND Q.C.-2 PCB/ASSY :F.A. RoadStar SHEET : 1 OF 1 RAW MATERIAL / CONSUMABLES : JIGS / FIXTURE INSTRUMENTS : PREPARED BY SR N STOCK NO LOC DESCRIPTION TV SET REMOTE HAMMER CHECKED BY CONNECT THE RF SIGNAL CORD TO TUNER.

  • Page 55: Cabinet Frontale Verniciato Con Scritte

    LOCAL 1500001000 LOCAL 4) vernice 1500002000 FA/LOC 3) vite per fissaggio pulsantiera, 4x12BT n.° 1100001767 3) logo ROADSTAR CTV 1450-KT n.° 1100009120 3) coperchio ricevitore IR n.° 1200001478 3) lente per led e ricevitore IR n.° 1200001725 3) rondella cinescopio in gomma, 6x22x3mm n.°...
  • Page 56 3) vite per assiemaggio cabinet, 4x16BT n.° FA/LOC 1100004229 Busta accessori n.° 3) libretto istruzioni n.° LOCAL 1100009248 LOCAL 3) scheda di garanzia Roadstar n.° 1100010179 n.° LOCAL 3) schema circuito elettrico CTV 1450KT, VE02 1100010167 3) lista Centri Assistenza Tecnica n.° LOCAL 1100010185 n.°...

  • Page 57: Vite Per Fissaggio Pulsantiera, 4X12Bt

    LOCAL 1500001000 4) vernice LOCAL 1500002000 FA/LOC 3) vite per fissaggio pulsantiera, 4x12BT n.° 1100001767 3) logo ROADSTAR CTV 1450-KT n.° 1100009120 3) coperchio ricevitore IR n.° 1200004809 3) lente per led e ricevitore IR n.° 1200004850 3) pannello decor. frontale verniciato con scritte n.°...

  • Page 58: Fascetta In Plastica, 2.5X100 Mm, Bianca

    3) vite per assiemaggio cabinet, 4x16BT n.° FA/LOC 1100004229 Busta accessori n.° 3) libretto istruzioni CTV-14/20/2150KT n.° LOCAL 1100009248 3) scheda di garanzia Roadstar n.° FA/LOC 1100010179 3) schema circuito elettrico, 2050/2150KT, VE01 n.° LOCAL 1100010168 3) lista Centri Assistenza Tecnica n.°...

  • Page 59: Sostegni Per Bobina Smagnet.- Filo Gommato

    5) plastica grezza LOCAL 1500001000 LOCAL 4) vernice 1500002000 FA/LOC 3) vite per fissaggio pulsantiera, 4x12BT n.° 1100001767 3) logo ROADSTAR CTV 1450-KT n.° 1100009120 3) coperchio ricevitore IR n.° 1200004809 3) lente per led e ricevitore IR n.° 1200004850 LOCAL 3) pannello decor.

  • Page 60: Revisione

    3) vite per assiemaggio cabinet, 4x16BT n.° FA/LOC 1100004229 Busta accessori n.° 3) libretto istruzioni CTV-14/20/2150KT n.° LOCAL 1100009248 FA/LOC 3) scheda di garanzia Roadstar n.° 1100010179 n.° LOCAL 3) schema circuito elettrico, 2050/2150KT, VE01 1100010168 n.° LOCAL 3) lista Centri Assistenza Tecnica 1100010185 n.°...

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Ctv-2050

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